Download OU B.Sc 2017 Dec 3rd Semester 7076 Electronics Analogue Circuits Question Paper

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FACULTY OF SCIENCE

B.Sc. (CBCS) II - Semester Examination, December 2017

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Subject : ELECTRONICS

Paper - II

Analog Circuits Max. Marks : 80 Time : 3 hours

Part - A (5 X 4 = 20 Marks)

(Short Answer Type)

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Answer any Five of the following questions.

1. Derive the expression for efficiency of a full wave rectifier
2. Derive the expression for the ripple factor of L-section filter.
3. Explain the terms line regulation and load regulation.
4. Explain about 7805 and 7905 IC voltage regulators.

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5. Discuss briefly the classification of amplifiers on the basis of operating conditions.
6. What is darlington pair? Give its merits and demerits.
7. What is an oscillator? Draw the circuit diagram of RC phase shift oscillator.
8. Draw the circuit diagram of an astable multivibrator.

Part — B (4 X 15 = 60 Marks)

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(Essay Answer Type)

Answer ALL questions from the following

1. a) Describe the operation of half wave rectifier with the help of circuit diagram and relevant waveforms. Obtain the expression for i) rectifier efficiency ii) ripple factor iii) voltage regulation
2. b) Explain how a series inductor filter reduces ripple. Derive the expression for Voltage regulation and ripple factor.
3. a) Draw the circuit diagram of the self bias circuit and explain its working.

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4. b) Explain the circuit diagram of the swamped amplifier and explain its working.
5. a) Derive the expressions for current gain, input impedance and output impedance for common-emitter transistor amplifier using h-parameters.
6. b) Explain the principle of feedback. Derive the expressions for gain, input impedance and output impedance of voltage series feedback amplifier.
7. a) Explain the working of Colpitt's oscillator and derive the expression for its frequency.
8. b) What are the different types of multivibrators? Briefly explain the operation of a monostable multivibrator.

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